Volume adjustment knob for power microphone



FIG. 1 is a reduced perspective view of a volume adjustment knob for a power microphone as seen from the bottom of the microphone showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a side view thereof, taken at a 90° angle of FIG. 3; and

FIG. 5 is a top plan view thereof.

In FIG. 1 the subject matter in broken lines is for illustrative purposes only and does not form part of my design. The knob is shown without design detail to merely illustrate its position in use. 

The ornamental design for a volume adjustment knob for power microphone, as shown and described. 